When multiple Rally() instances targeting the same workspace are created concurrently (e.g. from a thread pool), processSchemaInfo in entity.py wipes _rally_schema[wksp_ref] at the very start of execution before rebuilding it. Any concurrent thread that reads the schema during that window (via typedef → getSchemaItem) receives None, which causes an AttributeError in validateAttributeNames.
Root Cause
_rally_schema is a module-level global dict. processSchemaInfo does this:
_rally_schema[wksp_ref] = {} # wipes the shared dict immediately
for ix, raw_item_info in enumerate(schema_info): # rebuilds over time (~hundreds of iterations)
item = SchemaItem(raw_item_info)
_rally_schema[wksp_ref][item.ElementName] = item
...
_rally_schema[wksp_ref]['UserStory'] = _rally_schema[wksp_ref]['HierarchicalRequirement']
The wipe and rebuild are not atomic. Any thread reading _rally_schema[wksp_ref] during the rebuild window sees either an empty dict or a partially built one. UserStory and HierarchicalRequirement are assigned at the end — they are the most likely entries to be missing during a race.
perhaps I am misunderstanding how the lib works, or I am using it wrong, either way we keep encountering these AttributeErrors: AttributeError: ("'NoneType' object has no attribute 'Attributes'",). I made a pr with a proposed fix, any help or guidance would be much appreciated.
When multiple Rally() instances targeting the same workspace are created concurrently (e.g. from a thread pool), processSchemaInfo in entity.py wipes _rally_schema[wksp_ref] at the very start of execution before rebuilding it. Any concurrent thread that reads the schema during that window (via typedef → getSchemaItem) receives None, which causes an AttributeError in validateAttributeNames.
Root Cause
_rally_schema is a module-level global dict. processSchemaInfo does this:
_rally_schema[wksp_ref] = {} # wipes the shared dict immediately
for ix, raw_item_info in enumerate(schema_info): # rebuilds over time (~hundreds of iterations)
item = SchemaItem(raw_item_info)
_rally_schema[wksp_ref][item.ElementName] = item
...
_rally_schema[wksp_ref]['UserStory'] = _rally_schema[wksp_ref]['HierarchicalRequirement']
The wipe and rebuild are not atomic. Any thread reading _rally_schema[wksp_ref] during the rebuild window sees either an empty dict or a partially built one. UserStory and HierarchicalRequirement are assigned at the end — they are the most likely entries to be missing during a race.
perhaps I am misunderstanding how the lib works, or I am using it wrong, either way we keep encountering these AttributeErrors: AttributeError: ("'NoneType' object has no attribute 'Attributes'",). I made a pr with a proposed fix, any help or guidance would be much appreciated.